Firefighters carried out controlled burnings the previous night around the groves to clear away debris from the forest floor that could otherwise fuel a fire to such an intensity that it dangerously licks at the trees' crowns.
Lower-intensity fires, on the other hand, play a vital role in the reproductive cycle of the tough-barked sequoia, many of which bear the scars of past wildfires, by releasing the seeds from their cones and clearing the soil in which they germinate.
The blaze has edged out the 1932 Matilija wildfire in Ventura County to become the fourth-largest California wildfire on record, according to figures from the California Department of Forestry and Fire Protection.
Jarvis estimated that firefighting efforts had cost state and federal agencies about $54 million. He criticized a decline in federal funding for fire-prevention work, including the practice of controlled fires that make a wildfire of this intensity less likely.
More than 5,000 people are working to put out the fire, including firefighters from agencies across California and nearly 700 specially trained California prison inmates.
Some 4 million people visit Yosemite each year, most going during the peak months of June through August. Some 620,000 normally visit the park in August alone, but due to the fire, attendance has dropped.
"It's not super substantial, but it is noticeable," park spokeswoman Kari Cobb said earlier this week about the drop.
Tourism-dependent businesses around the park have bemoaned a slump in visitors at the peak of the late-summer tourist season.
The cause of the fire remains under investigation.
(Reporting by Jonathan Allen in New York and Kevin Murphy in Kansas City; Editing by Alex Dobuzinskis and Mohammad Zargham)
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